High quality S2 steel bits with a zinc phosphate finish, each size in 30 and 75mm lengths. Hardened (58-62 HRC) and tempered for added strength. Includes 3/8"" and 1/2""Sq drive to 10mm hex Chrome Vanadium steel bit adaptors. Supplied in storage case with inclined tray for quick and easy bit selection. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. High quality S2 steel bits with a zinc phosphate finish, each size in 30 and 75mm lengths. Hardened (58-62 HRC) and tempered for added strength. Includes 3/8"" and 1/2""Sq drive to 10mm hex Chrome Vanadium steel bit adaptors. Contents: TRX-Star* Bits; T20, T25, T30, T40, T45, T50, T55, T60 (1 each 30 and 75mm), Hex Bits; 4, 5, 6, 7, 8, 10, 12mm (1 each 30 and 75mm), Spline Bits; M5, M6, M8, M10, M12 (1 each 30 and 75mm), Drive Adaptors; 3/8""Sq x 10mm Hex, 1/2""Sq x 10mm Hex. Supplied in storage case with inclined tray for quick and easy bit selection. Lifetime guarantee*.